Sunday, 20 November 2011

Page No. 73Question 1. Scientists have actually found skeletons of fish in Sahara desert. What could have happened?Answer. Earlier Shara must have been a green and fertile region. But excessive and intensive use of land for cultivation, large-scale deforestation, excessive pollution of land, air, and water, and soil erosion could have led to the conversion of land into a desert. Gradually the green flourishing region must have converted into yellow barren land.

Friday, 18 November 2011

Question 1. River Brahmputra is known by different names in different places.Find the other names of the river.Answer. Tsangpo (in Tibet),Siang,Dihang,Jamuna(in Bangaladesh) are the other names of the river Brahmputra.

Page No. 49Question. Where do you find dwelling made of ice? Who makes them and what are they called.?Answer. Dwelling made of ice are found in the Polar Regions. Eskimo make them and they are called igloos.

Page No. 49Thing To DoQuestion. List the different modes of transport used by the students of your class while coming to schoolAnswer. Transport used by the students of our class while coming to school :

Monday, 14 November 2011

Question 1. Answer the following questions.Q(i).Which are the two factors on which the growth of vegetation mostly depends?Answer.Two factors on which the growth of vegetation depend are : (i) temperature and (ii) moisture.

Q(ii). Which are the three broad categories of natural vegetation?Answer.

Saturday, 12 November 2011

Question 1.Answer the following questions.Q(i).What is precipitation?Answer. Precipitation in the deposition of moisture from the atmosphere onto the earth's surface.This may be in form of rain,hail,frost,fog,sleet or snow.

Q(ii).What is water cycle?Answer..The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle.

Thursday, 10 November 2011

Question1.Answer the following questions.Q(i).What is atmosphere?Answer.A huge blanket of air by which our earth is surrounded is called atmosphere.
The atmosphere have following layers :
(a) Troposphere.
(b)Stratosphere
(c) Mesosphere
(d) Thermosphere
(e) Exosphere

Tuesday, 8 November 2011

Question 1. Answer the following questions.Q(i) . what is an ecosystem?Answer. The system formed by the interaction between living organisms themselves and between living and their surroundings is called an ecosystem.